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Fair Value Measurements - Change in Fair Value (Details) - Level 3 - Westrock Private Warrants $ in Thousands | 9 Months Ended
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Sep. 30, 2023 USD ($)
Fair Value Measurements |
Fair value as of beginning | $ 28,342
Transfer out of Level 3 | (18,916)
Change in fair value | (5,090)
Fair value as of ending | $ 4,336

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